Hi,there. First get to the South Bus Station of Suzhou from Suzhou train station and then take bus directing to Zhouzhuang.
Here are details: you can either go via jinrick-shaw (CNY5)or public bus (CNY2) to go to the South Bus Station of Suzhou, taking 5 to 10 minutes.
And then go to the Tourist Distribution Center to buy the ticket (CNY18) to Zhouzhuang. (Bus Frequency: 40minuts, Trip Time: 1 hour and a half. Last bus at 17:00)
At last, you can walk (15 minutes) to the scenic area or take jinrick-shaw (CNY5).